Which of the following stellar spectral types is cooler than our Sun?
A. K
B. F
C. O
D. G
Answer: A
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Io's volcanoes contribute material to a ________ around the planet Jupiter's equator
Fill in the blank(s) with correct word
A 2 500-kg car moving north collides with a 2 000-kg car moving west. After the collision, the cars stick together and move at an angle of 45° north of west at a speed of 8.0 m/s. What was the initial speed of the 2 500-kg car?
a. 20 m/s b. 10.2 m/s c. 14 m/s d. 9.3 m/s
A proton and a deuteron are moving with equal velocities perpendicular to a uniform magnetic field. A deuteron has the same charge as the proton but has twice its mass. The ratio of the acceleration of the proton to that of the deuteron is:
a. 0.5. b. 1. c. 2. d. There is no acceleration in this case.
A 320-g air track cart traveling at 1.25 m/s suddenly collides elastically with a stationary 270-g cart. What is the speed of the 320-g cart just after the collision?
A) 0.68 m/s B) 0.11 m/s C) 0.21 m/s D) 1.4 m/s E) 1.1 m/s